Oral cleansing and gum massaging means



v- 1969 wu WAI CHAO ORAL CLEANSING AND GUM MASSAGING MEANS 2 Sheets-Sheet 1 T? F v a m Filed May 27, 1966 5 w N m V l 7 A W 2 Sheets-Sheet 2 WU WAI CHAO ORAL CLEANSING AND GUM MASSAGING MEANS Y .0 e4 x. mm. 8 7. w 2/ 6 W 0 F 0 2/ W M M u -z 5 f mgk 0 8 0 mw H8 H01 .u/// A 7 4 y 5 fi O m 1/ \r A ,4 7 M 1 m a/ M2; W7 n/ 3 f v a 9 F a 7/, L a 6 i m a w Nov. 25, 1969 Filed May 27, 1966 ORAL CLEANSING AND GUM MASSAGING MEANS Wu Wai Chao, Bloomfield Hills, Mich., assignor to Sperry Rand Corporation, New York, N.Y., a corporation of Delaware Filed May 27, 1966, Ser. No. 553,424 lint. Cl. A61h 9/00; A61m 3/00 US. Cl. 12866 15 Claims ABSTRACT OF THE DISCLOSURE An oral cleansing and gum massaging apparatus wherein a pulsating jet discharge of fluid is effected through a discharge nozzle and wherein fluid amplifier means are provided having feedback means including capacitor means of predetermined dimensions for preselecting a desired rate of discharge pulsation.

The present invention relates to new and useful improvements in oral cleansing and gum massaging apparatus and more particularly to apparatus of the latter type which provides a pulsating fluid jet discharge.

Gum massaging and oral cleansing apparatus of the type adapted for home use which include means for applying a fluid, such as water or other liquid, against the gums and the interdental areas are well known for use in the maintenance of oral hygenic health. It has been found that devices of this type which discharge a pulsating jet of liquid are most desirable. These devices are effective not only to remove food particles or the like trapped in the interdental areas but are also effective in the course of the cleansing operation to administer a beneficial and stimulating massage to the gums through the alternate compression and relaxation of the gum tissue contacted by the pulsating jet of liquid.

These latter type devices usually include a hand held instrument provided with a discharge nozzle on one end thereof which is manipulable about the mouth to accomplish the cleansing and massaging operations. Various means have been employed in the past to produce the pulsation of the liquid through the discharge nozzle and which means include relatively complex assemblies and/ or various electrically powered pump mechanisms or the like which require a multiplicity of moving parts to effect pulsation of the liquid through the instrument and outwardly of the discharge nozzle.

It is an object of the present invention to provide novel gum massaging and oral cleansing means.

Another object is to provide novel gum massaging and oral cleansing apparatus wherein novel means are provided for producing a pulsating fluid jet output for application against the gums and interdental areas of the user.

Another object is to provide a gum massaging and oral cleansing device which utilizes fluid amplifier means for effecting a pulsating fluid jet discharge.

Another object is to provide a novel pulsating fluid massaging and cleansing device which does not require moving parts for producing a pulsating output or for controlling the frequency of pulsation.

A still further object is to provide a novel pulsating liquid gum massaging and oral cleansing device of relatively few parts which utilizes the usual household water supply as a source of pressurized fluid and wherein the intensity of the pulsating output is readily controlled by manipulation of the faucet handle.

The present invention contemplates a novel oral hygenic device for home use which utilizes a pulsating discharge jet of fluid for massaging the gums and cleansing the teeth. One embodiment of the device includes 2. cas- United States Patent "ice ing having a handle at one end thereof and discharge means including a nozzle extending from the other end adapted to be manipulated about the mouth for applying a pulsating fluid jet against the gums and teeth of the user. Fluid intake means are provided on the casing and which means are provided with a suitable connection with a source of pressurized fluid, such as a standard household water faucet, for supplying pressured fluid into the casing for channelling therethrough to the discharge nozzle. Fluid amplifier means are interposed between and operatively connected to the intake means and discharge means. The amplifier means include a power jet nozzle operable upon receipt of a stream of liquid from the intake means to channel a power jet of liquid to the discharge means. The amplifier means further include feedback means having control jet means operable at selec'ted intervals to periodically divert the power jet away from the discharge means to temporarily interrupt the discharge and thereby produce a pulsating jet output of the liquid through the discharge nozzle.

In one embodiment, the diverted stream is channelled outwardly of the device through drain means in the cas ing/In another embodiment, the discharge means include two discharge nozzles and a dual switching amplifier adapted to synchronously switch the stream from one discharge nozzle to the other whereby an alternating pulsating jet discharge is provided. In another embodiment, the amplifier means are adapted to alternately switch the stream from the discharge means to the feedback means. In addition, novel expandable capacitor means are contemplated for the feedback means of the fluid amplifier whereby the frequency rate of jet pulsation is selectively predetermined in accordance with the requirements of the user.

The above and other objects and advantages of the present invention will appear more fully hereinafter from the detailed description which follows taken together with the accompanying drawings wherein several embodiments of the invention are illustrated.

In the drawings:

FIG. 1 is a cross sectional view of an oral cleansing and gum massaging device in which is incorporated the present invention;

FIG. 2 is a fragmentary perspective view of the device of FIG. 1 and shows in exploded relationship the parts of the handle portion and fluid amplifier means provided therein;

FIG. 3 is a sectional view taken on the line 33 of FIG. 1;

FIG. 4 is a sectional view taken on the line 44 of FIG. 1;

FIG. 5 is a sectional view taken on the line 5-5 of FIG. 1;

FIG. 6 is a cross sectional view of an alternate form of a discharge nozzle for the device of FIG. 1;

FIG. 7 is a fragmentary cross sectional view of the device of FIG. 1 and illustrates a variation of the amplifier means thereof;

FIGS. 8, 9 and 10, respectively, are cross sectional views of oral cleansing and gum massaging devices incorporating other embodiments of the present invention;

FIG. 11 is a sectional view taken on the line 1111 of FIG. 8;

FIG. 12 is a sectional view taken on the line 12-12 of FIG. 8;

FIG. 13 is a sectional view taken on the line 13-13 of FIG. 9; and

FIG. 14 is a sectional view taken on the line 14-14 of FIG. 10.

Referring now to the drawings for a more detailed description of the present invention an oral cleasing and gum massaging device which incorporates one embodiment of the present invention is generally indicated by the reference numeral 20 in FIGS. 1 and 2. Instrument 20 includes a casing of suitable premolded plastic material and which casing includes a handle portion 22 comprised of mated sections 23, 24 and 25 respectively, which are sealed together by any suitable means to provide a leakproof enclosure.

A fluid intake tube 26 (FIGS. 1 and 2) for supplying pressurized fluid to handle 22 has one end secured to section 24 of handle 22 and has the opposite end thereof (not shown) provided with any well known adaptor means for attachment to a suitable source of presurized fluid, as for example, a standard household water faucet. Means 27 are provided for receiving and discharging pressurized fluid received in handle 22 from intake tube 26 against the gums and interdental areas of the user and which discharge means include an elongated stern portion 28 having a discharge nozzle 29 at the free end thereof.

It will be understood that stem 28 may be connected to handle 22 in any suitable manner as for example, by a suitable elongated flexible tubing whereby a user holds only stem 28 during use of the instrument or stem 28 if desired may be formed integrally with the handle 22. As illustrated in FIG. 1, stem 28 is threadily fastened to handle 22 and in engagement with a sealing ring 30 whereby other stems are readily interchangeable on handle 22 to allow instrument 20 to be used by a number of persons.

As mentioned, it is a feature of the present invention to provide fluid amplifier means whereby pressurized fluid entering handle 22 issues from discharge means 27 in pulsating jets. Fluid amplifiers are known in the art and generally include a power nozzle for injecting a power fluid jet through channel means in the amplifier wherein the stream is directed to selected output passages. In addition, feedback passages are provided to receive a portion of the stream for discharge through control jet ports to laterally engage the power jet and selectively control or switch the direction of flow of the power jet in the channel means.

To this end, fluid amplifier means 32 are provided in handle section 22 and which means 32 are interposed between and operatively connected to intake tube 26 and discharge means 27. Amplifier means 32 include a power jet nozzle 33 formed in handle section 22 and which nozzle 33 is in communication with intake tube 26. Channel means extend from power nozzle 33 and include a passage 36 which merges with an axially extending bore 37 in stem 28 which terminates at the discharge nozzle 29. A feedback passage 40 is also formed in section 24 and has an opening 41 communicating with pasage 36 downstream from power nozzle 33. Feedback passage 40 further includes a restriction 42, a capacity chamber 43 and a control jet port 44 opening to channel passage 36 adjacent power nozzle 33.

Drain means are provided in handle section 23 (FIGS. 2, 3 and 4) and include a drain chamber 46 having a connection with a drain tube 47 connected to section 23 and leading outwardly of handle 22 to a sink or the like. Drain means further include a port 49 in alignment with control jet port 44 and vents 51 communicating with passage 36 and feedback passage 40 for purposes to be hereinafter explained.

In operation of the described device when a pressurized fluid such as pressurized water from a household water faucet enters handle 22 through intake tube 26 a power jet of fluid is injected by power nozzle '33 through passage 36 and axial bore 37 outwardly of discharge nozzle 29. A portion of the power jet stream enters feedback passage 40 through opening 41 filling capacity chamber 43. When chamber 43 is filled, the fluid therein discharges through control jet port 44 in a known manner and laterally engages the power jet to divert the jet through drain port 49 to chamber 46 of the drain means whereat the stream flows outwardly of casing through an outlet tube 47 and the flow to discharge nozzle 38 is interrupted. Upon depletion of the discharge of the control jet from the capacity chamber 43 the power jet is again directed through passage 36 and axial bore '37 to discharge nozzle 29 with a portion of the stream again entering feedback passage 40 to initiate a recycling of amplifier 32.

As is apparent, the continuous recycling of amplifier 32 as described effects a pulsating fluid jet discharge through discharge nozzle 38. It will be understood that restriction 42 in feedback passage 40 determines the rate of flow into capacity chamber 43 and together with the capacity of chamber 43 determines the discharge of the control jet through control port 44 to establish the frequency of jet pulsation at discharge nozzle 29. The intensity of the pulsating jet output through discharge nozzle 29 is readily adjusted "by the user through manipulation of the water faucet whereby the input pressure of the water through the intake tube may be raised or lowered as desired.

If desired, nozzle 29 may contain more than one orifice as is illustrated in FIG. 6 wherein two orifices 29A and 29B are provided at the end of bore 37. In this manner, the pulsating jet output is divided into a plurality of jets in accordance with the number of orifices provided.

In addition, valve means are contemplated for incorporation in instrument 20 for providing means to stop the discharge of fluid through discharge nozzle 29 when desired. In FIGS. 1 and 5, a valve is illustrated as comprising a spring biased push button 52 having a stem 53 provided with an opening 54 (FIG. 5) which registers with axial bore 37 to permit passage of fluid therethrough. Manual depression of push button 52 moves an imperforate portion 55 of stem 53 into passage 36 to block the flow of fiuid from passage 36 to axial bore 37. The flow is then directed from amplifier 32 through vents 51 to drain chamber 46 and then outwardly of the casing through outlet tube 47. When button 52 is released the cycling of amplifier 32 as described above is reinstituted.

In FIG. 7 novel means are shown for selectively varying the capacity of chamber 43 in the feedback passage 40 of instrument 20 of FIGS. 1 to 5 whereby the frequency of jet pulsation output through nozzle 29 is readily varied in accordance with the requirements of the user. In this embodiment, an expandable tube or pouch member 58 made of suitable elastic material is disposed within chamber 43. Pouch member 58 has the opposite open ends thereof connected to feedback passage 40 at opening 41 and at control jet port 44. Pouch 58 is of a selected predetermined capacity and is adapted to be expanded to full capacity as indicated by broken lines in FIG. 7 by that portion of the stream entering feedback passage 40 with the contents thereof adapted to discharge through control jet port 44 to divert the direction of flow of the power jet in the manner described.

As will be apparent, since the capacity of pouch 58 determines the frequency of the control jet discharge through control port 44, the frequency of jet pulsation output through discharge nozzle 38 is selectively varied in accordance with the predetermined capacity of the pouch member 58. In this manner, the same casing can be used to provide a pulsating jet output of selected frequencies in accordance with the capacity of the pouch 58 used and is not limited by capacity of the chamber 43 as premolded in handle sections 24 and 25.

In FIGS. 8 to 14 are illustrated other embodiments of fluid amplifier means of the present invention for effecting pulsation jet discharge of the discharge means of the device.

The embodiment shown in FIGS. 8 and 11 includes a pair of discharge nozzles 60 and 62 provided in stem 28 and amplifier means adapted to discharge alternating jets of fluid therethrough as indicated by arrows A and B respectively in FIG. 8. In this manner a fluid massage is elfected which is adapted to knead the gum tissue contacted. To this end, a fluid amplifier 64 of the dual switch ing type is provided and includes a power nozzle 65 opening to a channel 66 having passages 67 and 69 in communication respectively, with a pair of spaced and parallel axial bores 70 and 72 which each lead to one of the discharge nozzles '60 and 62. A pair of feedback passages 74 and 75 are provided in passages 67-69 each having a restriction 76, capacity chamber 77 and a control jet port 78. Drain means 79 are also provided in casing section 24 having a duct opening to channel 66.

In operation of this embodiment, the power jet entering handle 22 through power nozzle 65 is adapted to initially lock onto passage 67 whereby a portion of the Power jet is directed through bore 70 and discharged through nozzle 60 with the remaining portion entering feedback passage 74 to fill chamber 77 thereof. Upon discharge of feedback passage 74 through control port 78 thereof, the control jet engages the power jet switching the latter to lock onto passage 69 with a portion of the power jet directed through bore 72 and outwardly through nozzle 62 with the remainder of the flow entering feedback passage 75.

When capacity chamber 78 of feedback passage 75 discharges through its control port 78 it engages and switches the power jet back to passage 67. In this manner, the power jet is alternately switched from a passage 67 to passage 69 to eflect an alternating jet pulsation output through nozzles 60 and 62. If the output through nozzles 60 and 62 is interrupted, as for example, by closing of push button valve 80 the power jet will be diverted through ducts 71 outwardly of the casing from drain chamber 79 through drain tube 47. Valve 80 is similar to that described with respect to valve 52 of FIGS. 1 to 6 except that the stem of valve 80 is provided with two openings 81a (FIG. 12) which register respectively with bores 70 and 72 in unactuated condition of the valve and has imperforate portions 81b for blocking the passage of fluid.

The embodiment of FIGS. 9 and 12 is similar in operation to that of the previously described embodiment of FIGS. 1 to 6. In this embodiment, amplifier means 82 (FIG. 9) are provided which include a power nozzle 83 and a feedback passage 84 having a restriction 85, capacity chamber 86 and control port 87. In addition, a channel output passage 88 is provided in communication with bore 37 in stem 28 leading to discharge nozzle 29. In this embodiment, the power jet nozzle 83 is formed in section 24 whereby the power jet is biased in the direction of feedback passage 84.

In operation, when pressurized fluid is introduced into handle 22 through intake tube 26, the power jet is directed by power nozzle 83 to feedback passage 84. Upon filling, feedback passage 84 discharges through control port 87 whereat the power jet is engaged by the discharging control jet and is switched to lock onto wall 89 of channel passage 88 to divert the power jet through channel passage 88, bore 37 and outwardly of stem 28 through discharge nozzle 29. Upon depletion of the discharge of the control jet through control port 87 the power jet is switched back to feedback passage 84 and the output through passage 89 to discharge nozzle 29 is interrupted until the control jet is reinitiated to switch the power jet to passage 89 upon recycling of amplifier means 82. In this manner, a pulsating jet output of fluid is provided at discharge nozzle 29. Drain means 91 are provided to conduct the power jet outwardly of the casing through the drain tube 47 in the manner previously described with respect to the embodiment of FIGS. 1 to 6 upon operation of valve means 52.

As will be apparent, the previously described expandable tube pouch means 58, if desired, is adaptable for use in capacity chambers 74 or 75 of FIG. 8 and chamber 86 of FIG. 9 for selectively controlling the frequency of fluid jet discharge as described.

Ths embodiment shown in FIGS. and 14 discloses a cyclindrical casing wherein is provided fluid amplifier means 91 having a power jet nozzle 92 in communication with but spaced from an elongated discharge tube memher 93 disposed within a chamber 94 of the instrument and which tube 93 leads to a discharge nozzle 95. Restriction means, and capacity chamber means, are provided which include a feedback tube 96 having a port 96A opening to tube 96. Tube 96 is coiled about discharge tube 93 and is provided with a feedback 97 extension connected to a control jet port 98 adjacent power nozzle 92. If desired tube 96 may be of elastic material to provide expandable capacity chamber means for controlling operation of control jet port 98 in a manner to be hereinafter described.

In operation of this embodiment, the pressurized fluid entering the casing from the intake tube is directed by power nozzle 92 to tube 93 wherein a portion of the flow is direct-ed through tube 93 and discharges through nozzle 95. The remaining portion of the flow is diverted through port 96A to coiled tube 96 and discharges through control port 98. The control jet through port 98 interrupts and diverts the power jet at nozzle 92 away from tube 93 into chamber 94 and outwardly of the casing through the drain tube 99 to thereby interrupt the flow to nozzle 95. Upon depletion of the discharge flow from tube 96 through control jet port 98, the power jet is reinjected into tube 93 and amplifier 91 is recycled.

In this manner, a pulsating jet output is effected at discharge nozzle through repeated cycling of amplifier 91 as described. Coiled tube 96 provides a time delay flow passage in comparison to tube 93 to allow the portion of the flow in tube 93 to discharge through nozzle 95 prior to discharge of the flow in tube 96 through control port 98. The frequency of jet pulsation is therefore readily predetermined in accordance with the selected dimensions of tube 96 to provide a time delay discharge therethrough as described. In some instances in order to effect the required time delay, tube 96 might have the same transverse cross sectional dimension as tube 93 but with tube 96 being of greater length than tube 93 to insure prior discharge fo tube 93 or, if desired, tube 96 would have a greater transverse cross sectional dimension than tube 93 to effect the desired time delay. If tube 96 is formed of elastic material, then thefrequency of jet pulsation can be varied in accordance with the selected elastic properties thereof for determining the selected time delay discharge through control jet port 98.

It will be apparent from the foregoing description that the novel oral cleansing and gum massaging device has many advantages in use. Among other advantages, economical and effective means are provided for producing a pulsating fluid jet output for massaging gums and cleansing the interdental areas of a user without the use of any moving parts. Further advantages reside in the fact that a compact, durable, and lightweight instrument is provided wherein the frequency of pulsations is readily predetermined and the intensity of the pulsating jet is readily controlled by the user.

It is to be expressly understood that the present invention is not limited to the embodiments illustrated and described. Various changes can be made in the design and arrangement of parts without departing from the spirit and scope of the invention, as the same will now be under stood by those skilled in the art.

What is claimed is:

1. Oral cleansing and gum massaging apparatus comprising:

(a) a casing,

(b) discharge means including a nozzle for discharging pressurized fluid,

(c) means interconnecting said discharge means to said casing,

(d) intake means on said casing adapted for connection to a source of pressurized fluid for receiving and supplying a stream of the pressurized fluid to said discharge means, and

(e) fluid amplifier means arranged within said casing and interposed between and operatively connected to said intake means and said discharge means for controlling movement of said stream of fluid,

(f) said fluid amplifier means including feedback means having capacitor means of preselected dimensions for receiving a portion of said fluid directly from said intake means, said capacitor means operable to discharge at predetermined intervals in accordance with said preselected dimensions and divert the stream of fluid away from said discharge means to effect a pulsating jet discharge of pressurized fluid through said discharge nozzle at a preselected rate of pulsation.

2. Oral cleansing and gum massaging apparatus comprising:

(a) discharge means including a nozzle for discharging pressurized fluid,

(b) intake means adapted for connection to a source of pressurized fluid for receiving and supplying a stream of the pressurized fluid to said discharge means, and

(c) fluid amplifier means interposed between and operatively connected to said intake means and said discharge means for controlling movement of said stream of fluid,

(d) said fluid amplifier means including a power nozzle in communication with said intake means and channel means extending from said power nozzle to said discharge means for directing a power jet of fluid received from said power nozzle to said discharge means,

(e) said fluid amplifier means further including feedback means having a feedback passage open to said channel means downstream from said power nozzle and extending from said channel means to said power nozzle and having a control jet port opening into said channel means adjacent said power nozzle,

(f) drain means having a port opening to said channel means and aligned with said control jet port, and

(g) capacitor means of preselected dimensions arranged within said feedback passage and adapted to receive a portion of said fluid directly from said intake means, and said capacitor means being periodically operable in a preselected cycle to discharge the fluid received therein from said intake means through said control port at predetermined intervals in accordance with said preselected dimensions to divert the power jet from said power nozzle through said drain port and interrupt the flow of fluid to said discharge nozzle whereby a pulsating jet discharge of pressurized fluid through said discharge nozzle is effected at a preselected rate of pulsation.

3. The device of claim 1 wherein said discharge means includes two discharge nozzles each having a discharge passage associated therewith, and wherein said fluid am plifier means is operable to alternately switch the stream I of fluid received from said intake means between said discharge passages to effect synchronous alternate pulsations of fluid through said discharge nozzles.

4. The device of claim 3 wherein said fluid amplifier means comprises a power nozzle in communication with said intake means, channel means extending from said power nozzle to receive a power jet of fluid from said power nozzle, said channel means including communicating passages with each of the discharge passages, said feedback means including feedback passages downstream from said power nozzle, and each open to one of said communicating channel passages, each of said feedback passages extending to said power nozzle, and having control jet ports adjacent said power nozzle, said power nozzle normally directing said power jet to one of said communicating passages to bias the power jet to the discharge nozzle associated there-with, and said feedback passage means of said latter channel passage being periodically operable to discharge through the control jet port thereof fluid received therein to divert the power jet to the passage of the other discharge nozzle.

5. The device of claim 1 wherein said fluid amplifier means comprises a power nozzle in communication with said intake means, channel means extending from said power nozzle to said discharge means for directing a power jet of fluid received from said power jet to the discharge means, said channel means including a communicating passage with said discharge means and said feedback means to said power nozzle, a control jet port in said feedback means open to said channel means adjacent said power nozzle, said power nozzle adapted to bias the power jet in the direction of the communicating passage to said feedback means whereby said stream of liquid is directed thereto, said control jet port operable upon discharge of said feedback means to switch the power jet to said communicating passage of said channel means with said discharge means.

6. The device of claim 1 wherein said feedback capacitor means includes a chamber of predetermined capacity having a control port at the egress thereof for discharging the fluid therein against said intake means, and restriction means at the entry of said chamber for controlling the rate of flow of fluid into said chamber and thereby the frequency of discharge of the fluid in said chamber through said control port.

7. Oral cleansing and gum massaging apparatus comprising:

(a) discharge means including a nozzle for discharging pressurized fluid,

(b) intake means adapted for connection to a source of pressurized fluid for receiving and supplying a stream of the pressurized fluid through said discharge means,

(c) fluid amplifier means interposed between and operably connected to said intake means and said discharge means for controlling movement of said stream of fluid,

(d) said fluid amplifier means including feedback means having capacitor means of preselected dimensions for receiving a portion of said fluid directly from said intake means,

(e) said capacitor means including a chamber of predetermined capacity having a control port at the egress thereof for discharging the fluid therein against said intake means, and restriction means at the entry of said chamber for controlling the rate of flow of fluid into said chamber and thereby the frequency of discharge of the fluid in said chamber through said control port,

(f) expandable pouch means of a selected predetermined capacity disposed within said capacity chamber and adapted for expansion by that portion of the stream entering said feedback chamber through said restriction means,

(g) said pounch means adapted to discharge at predetermined intervals through said control port upon expansion to said predetermined capacity thereof to divert the stream of fluid from said intake means away from said discharge means and effect a pulsating jet discharge of pressurized fluid through said discharge nozzle at a preselected rate of pulsation.

8. The device of claim 1 wherein said fluid amplifier includes a power nozzle, elongated first channel means in communication with said power nozzle and discharge means, feedback means wherein said capacity means includes elongated second channel means terminating in a control port adjacent said power nozzle, said power nozzle adapted to direct a portion of the fluid to each of said channel means, with said elongated second channel means being of predetermined greater length then said first channel means and adapted to periodically discharge through said control port to periodically divert the power jet away from said first and second channel means.

9. An oral cleansing and gum massaging device comprising:

(a) an elongated hand-held casing,

(b) intake means on one end of said casing adapted for connection to a source of pressurized fluid for receiving and directing a stream of pressurized fluid into said casing,

(c) discharge means at the other end of said casing for receiving pressurized fluid from said intake means,

(d) said discharge means including a stem member having a discharge nozzle at one end thereof and connected at the other end to said casing,

(e) fluid amplifier means within said casing and operatively connected to said intake means and said discharge means for controlling movement of said fluid through said casing, and

(f) said fluid amplifier means including feedback means having capacitor means of preselected dimensions for receiving a portion of said fluid directly from said intake means, said capacitor means operable to discharge at predetermined intervals in accordance with said preselected dimensions and divert the stream of fluid away from said discharge means to etfect a pulsating jet discharge of pressurized fluid through .said stem and outwardly of said discharge nozzle at a preselected rate.

10. The device of claim 9 where in drain means are provided in said casing to receive the diverted portion of said stream, said drain means including means for directing said stream portion outwardly of said casing.

11. The device of claim 9 wherein said fluid amplifier means further includes a power nozzle in communication with said intake means, channel means including a passage extending from said intake means to said discharge means for channelling a power jet of fluid from said intake means to said discharge means, and said feedback means further including a feedback passage open to said channel means downstream from said power nozzle and having a control port open to said channel means adjacent said power nozzle, said capacitor means of said feedback means arranged within said feedback passage and adapted to receive a portion of said stream of fluid and operable to periodically discharge through said control port to divert the power jet away from said discharge means at a predetermined frequency in accordance with the preselected dimension of said capacitor means.

12. The device of claim 11 wherein said discharge means include an axial extending bore in said stem portion, having one end in communication with said discharge nozzle and the other end communicating with said channel means.

13. The device of claim 9 wherein said casing is formed of premolded plastic material and wherein said fluid amplifier means and discharge means are of preselected dimensions formed in said casing.

The device of claim 11 wherein said feedback passageincludes a restriction therein adjacent to and open togaid channel means, a chamber open to said restriction and said control port, said restriction and chamber being of ipreselected dimensions and capacity respectively to select'ively control the entry and discharge of said fluid respectively into said chamber and through said control poit to provide a predetermined frequency pulsation of fluid through said discharge nozzle.

155. The device of claim 14 wherein said capacity chamberincludes a pouch member of expandable material and of selected dimensions whereby the volume of said chamber is selectively predetermined to control the frequency of jet pulsation.

References Cited UNITED STATES PATENTS L. W. TRAPP, Primary Examiner US. Cl. X.R. 

